Telephone repeating device.



D. H. WILSON.

TELEPHONE REPEATING DEVICE.

APPLICATION FILED APR.I1,1913.

w, Y @gf/' 6 i To-aZZ whomo't'may/ concern .device suitably `.conn.ected` incircuit. .i Referring. now` to the drawing,

.a ieri! 1 Devine; Witsen, or new Yoan, n'. Y.

'inrinenonn nn'rnarnvdfnnvon.

meegaat.

Be lit known that'I, DAvID.-H. ;W1Lsoiv,^a citizen of theUnited States,' residing. at Neiv Y.ork,-iii the county-'of New-Yorkl and State .of NewYork, .have invented va certain new and '.usefulqllniprovement inv Telephone Repeating Devices, of whichthe following ifs la specification.

rI`his invention relates to. telephone repeaters and lias for its object-to provide a new'v and 'improved deviceof thisA description.y l l l The: invention -is'illustr'ated in the accompanying .drawings wherein. l' have shown diagrammatically one Atorna of repeating shownV a main line'1 connected ,in circuit wi-tli the telephone stations 2 andl 3. linter-l mediate these statio'ns may. he placed one or more v of the .repeating instruments. yFor 'pui-poseot' illustration, I have shown one of they repeating devices. This device consists of an induction coil, preferably afdu'plex induction coil, having the cores 4 andI 5 conn 'ectedtogether 'by suitable ,pole pieces. Wound upon .these cores are the secondary y coils'ti and 'fl'. which are connected with the main, line 1. 'Tliese cores are. also provided 4with primary coji'ls 8 and v9. The'primary coil 8 is connected'by a 4conductor 10 with -a source ot' electri'csupply 11 which-in turn is connected with' one' terminal of the transmitter 12, the other 'terminal being connected bya conductor 13 with the 'coil '8. -The 'diaphragm of the transmitter 12 is actuated'by the pole pieces of theperinanent magnet'lll. Associated with .the induction 4coil is an amplifier having coresv 15 and 16.' One of these cores', as for example, tliecore 15 is vprovided lwith a coil 1'? which is connected in circuit with a coill 18, associated with the permanent magnet 14. g

4The primary coiliQfof the induction coil is'connected vby conductor 19 with a source of electric supply 2O which in turn is `connected to one lterminal of the transmitter 21,l

the other terminal of said transmitter being connected by" conductor 22 with the primary ycoil 9. .The transmitter .21 is arranged so thatthe diaphragm theieoffwill befactiiated by the permanent magnet 23.

is connectedin 4circuit with a coil 25 on the core 1G oi' the amplifier. The-core 15 of the amplifier is provided with a coil 26 and the I have' A coil' '2l is associatedvwith this permanent magnet and 'Specification of etters llatent.V .Patented Feb. liti, illlli.' Application inea .apen-1i, i913.; seriaiivo. 760,465.-

,core 16: with a coil 27, the two coils being connected in series and'being connected in the main line, said latter -connection beingments.y I haveillustrated'these stations as provided Iwith a transmitter 32, ay source of electric supply 33 connected in circuit therewith and aprimaiy coil 34 of an induction [coil connected in ycircuit therewith. .The main line 1' is provided at each 'station' with asecondary coil 85, said'inain vline being 'grounded atp36. U'

The use and1 operationof my invention are las follows:I if for example some one talks into the' transmitter at station 3.a talking current is setup in the main line 1. This ltalking current then passes through the lsecondary coils (i, 6, of the transiorniei and then passesA on t'o the'station 2. A. portionl of this current divides and passes through conductor 28 and then through. the primary .coils 2G and 2i' ofthe amplifier,

' and thence to ground. This sets up an in duced talking current 'in |the 'secondary ycoils 17.and 25 ofthe amplifier which talking current passes through coils 18- and 24 associated with' the permanent magnets let and 23.. This current causes the diaphragins ot' the transmitters 12 .and Qi'to be operated thereby producing aI similartalking current in the primary coils 8 and 9 of the induction titl coil, said talking currentbeing greatly increased bythe sources of electric supply it and '20. The coils 8 and 9 tlieii inducen,

talking currentainfthe secondary oils 6 and .7 thereb strenthenimr the talkin(T current in said coils which enlarged and augmented talking current is transmitted to the station2. lVhen the personat station 2 talks. the action will he the saine except in the re versed direction. It will 'thus be seen that l have here a sim )le re 'ieatini'r device which.l

may be located at any desired point and which increases vand reinforces the talking current as itpasses from one station to another. It will further be 'seen lthat'this repeater is iised'inponv a grounded. circuit g through great distances by means of grounded circuit. l cla-1mi,amT

-=.,k f'ir 1g 'aA mainline grounded circuit, a main line coil in said circuit, a lcore for sald coll,

" a multiple .'coil in. multiple with said main.

line circuit,"said coil connected to. ground anda condenserbetween s'aid coil and the' 'mam-:line circuit and between said coil and,y

25 'tho. ound, .a core for. said multi-ple coil, "a lo I Acircu-it'coil onfthe core-of: the main v"limcicircuit coil, afsource of electric supply 4andiaf transmitter in' circuit with said' local f 'f circuit coil, la,4 .coil onf the core of said mul- 'jo'ftiple circuit coi1,*. a second coil i'n circuit therewith,, said' second coil provided with 3 l. ielphonejrepeatlng device, compris- I gtliereby permitting. longdi'stance teleplaom"- l. 5 14A telephone repeating' device (-:onr'ipris-v line coilv in ysaid circuit, a core .for 'said coil, a1 multiple-coillin multiple-with said main- ,a corerfonactuatingthe diaphragm of said j wf line circuit, a main linel coil' A amasar therein, a core Jfor said coil,` a multi-ple coil connected in multiplewith the Inain line, said multiple coil connected to the ground, .a core for-said multiple coil, a local circuitl coil on the core of the main line coil, a source of electric supply and a transmitter in circuitwith said local circuit coil, a coil on the core of said multiplecoil, a second 'coil in circuit therewith 'and a core for said second coil, said' core actuating the receiver of said transmitter.l l

v LA telephonerepeating devicecomprising a groundedmain linecircuit, anI in-` ductionV coil associated therewith having a' primary and a secondary. coil, the secondaryA coil being in' the main line circuit, a

1 local circuit containing a source'of electric supply Iand a transmitter connected with said primary circuit, a primary coil connected in multiple with the main line and 55 connected to the ground, a core therefor, a

secondary Acoil .on said co're, a local circuit with which 'said secondary coilis connected, a coil; in said local circuit, and a core about which said coil is Wound,- said core actuating 'the di phragm of said transmitter.

In' estimony whereof., I affix my signai ture in the presence of Witnesses this 10th day of April 1913.

I I DAVID H. WLSONH Witnessesz' A F. W. SEYBoL'r,

. JOHN RJDAVIDSON', Corni@` M. WILSON- 

